class_docstr: Dummy Decoder that delegates to individual real Decoders.
code: def map_state(self, fn):
      for model_decoder in self.model_decoders:
          model_decoder.map_state(fn)
  
imports: import torch
  import torch.nn
  from onmt.encoders.encoder import EncoderBase
  from onmt.decoders.decoder import DecoderBase
  from onmt.models import NMTModel
  import onmt.model_builder
label_desc: Use image node_id 5 for calling the EnsembleDecoder obj's underlying member method code with example usage: obj.map_state(fn) without return types